岩棉在船舶舱室降噪中的应用研究

大连海事大学

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业 论二○一六年六月

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岩棉在船舶舱室降噪中的应用研究

专业班级： 轮机工程2012-18 姓 名： 丁炜东 指导教师：

轮机工程学院

摘 要

首先，本文简要介绍了船舶噪声的来源、噪声的传播途径和噪声的控制方法。然后对吸声技术、隔声技术、隔震技术、阻尼减震降噪技术等减震降噪方法进行了研究。对统计能量分析方法声学模型中的基本参数包括模态密度、内损耗因子、耦合损耗因子和输入功率的定义、选取原则和确定方法进行了学习。借助VA One软件，建立舱室SEA统计能量分析模型。为了更好的对结果进行比对，首先对未在内饰板和舱壁板中间填充岩棉的情况下模拟，然后在内饰板和舱壁板中间填充不同厚度的岩棉进行模拟，分析填充岩棉前、后以及不同厚度时在各个频段的降噪效果。通过对数据的分析和比较来验证在内饰板和舱壁板中间填充岩棉的降噪效果。

关键词：船舶舱室；噪声控制；统计能量分析；岩棉

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ABSTRACT

Firstly, this paper briefly introduced sound source of the cabin, noise radiation methods and control methods. Then this paper researched various methods of vibration and noise reduction, which including sound absorption, sound isolation, vibration isolation technology, damping vibration and noise reduction technology. Learn the definition of the concept, the selection principle and method for determining of the basic parameters of the acoustic model of statistical energy analysis method, including modal density, damping loss factor, coupling loss factor and the input power. By the software VA One, establish the statistical energy analysis model. In order to get better results of the test, we first tested trim panel and bulkhead plate without any material between them and then we tested the situation that filled different thickness rock wool between them to analyze the reduction of noise without the rock wool or not and with the different thickness of rock wool. Through the analysis and comparison of test data to prove rock wool’s effect of reduction the cabin noise.

Keywords: vessel cabin；noise control；statistical energy analysis；rock wool

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目 录

第1章 绪论 ......................................................................................................................... 1

1.1 研究背景 ................................................................................................................. 1 1.2 本文研究内容 ......................................................................................................... 2 第2章 船舶降噪方法概述 ................................................................................................. 3

2.1 吸声处理 ................................................................................................................. 3

2.1.1 吸声技术三参数 ........................................................................................... 3 2.1.2 吸声处理方式 ............................................................................................... 4 2.2 隔声技术 ................................................................................................................. 5

2.2.1 隔声原理和隔声量 ....................................................................................... 5 2.2.2 隔声结构 ....................................................................................................... 6 2.3 隔振技术 ................................................................................................................. 6

2.3.1 隔振的基本原理 ........................................................................................... 6 2.3.2 浮筑隔振结构 ............................................................................................... 7 2.4 阻尼减震技术 ......................................................................................................... 7 第3章 统计能量分析方法的基本原理及VA One软件 .................................................. 9

3.1 统计能量分析方法的基本原理 ............................................................................. 9 3.2 子系统间能量平衡方程 ......................................................................................... 9 3.3 统计能量分析方法参数的确定 ........................................................................... 11

3.3.1 模态密度的确定 ......................................................................................... 11 3.3.2 内损耗因子的确定 ..................................................................................... 11 3.3.3 耦合损耗因子的确定 ................................................................................. 13 3.3.4 输入功率的确定 ......................................................................................... 14 3.4 VA One的应用过程 .............................................................................................. 15 第4章 不同厚度岩棉对舱室降噪的影响 ....................................................................... 16

4.1 实验介绍 ............................................................................................................... 16 4.2 实验数据及处理分析 ........................................................................................... 17 4.3 本章小结 ............................................................................................................... 19 结论 ..................................................................................................................................... 20 参考文献 ............................................................................................................................. 21 致谢 ..................................................................................................................................... 22

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